python3Packages.adal: drop cryptography requirement

There is no usage of cryptography in that library.

pkgs/development/python-modules/adal/default.nix

···
     hash = "sha256-HE8/P0aohoZNeMdcQVKdz6M31FMrjsd7oVytiaD0idI=";
   };
 
+  postPatch = ''
+    sed -i '/cryptography/d' setup.py
+  '';
+
   propagatedBuildInputs = [
     pyjwt
     python-dateutil